Mayors Against Illegal Guns, Bloomberg, Michael R., Mayor of New York City and Coalition Co-Chair, Menino, Thomas M., Mayor of Boston and Coalition Co-Chair & (2013, January 30). Chairman Leahy and Ranking Member Grassley:. Retrieved April 3, 2013, from http://sampan.org.

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Includes reported contributions to congressional campaigns of Senators in office during the 113th U.S. Congress, from interest groups invested in the vote according to MapLight, October 1, 2008 – September 30, 2014.Contributions data source: OpenSecrets.org